Question

1. which of the following is a common gmaw application?

a) baking bread
b) sewing clothes
c) automotive welding
d) plumbing repairs

1. what minimum safety equipment should a welder always wear when performing gmaw?

a) safety knee pads
b) earplugs
c) welding helmet with appropriate filter, safety glasses, leather gloves and a welding jacket.
d) gardening gloves

1. gmaw is suitable for which of the following welding positions?

a) flat, horizontal, vertical, and overhead
b) only vertical and overhead
c) only flat position
d) only horizontal position

1. what is the purpose of the wire feed speed control in gmaw?

a) adjust the arc voltage
b) regulate the gas flow rate
c) control the wire diameter
d) manage the welding current

1. when welding with gmaw, what does \spatter refer to?

a) the metal filler wire
b) excessive sparks
c) unwanted drops of molten metal
d) the shielding gas

1. what is the typical diameter of the welding wire used in gmaw?

a) 1/16 inch
b) 1/8 inch
c) 0.030 to 0.045 inch
d) 1/4 inch

Explanation:

• Question 13: GMAW (Gas Metal Arc Welding) is commonly used in automotive welding. Baking bread is a culinary process, sewing clothes is a textile - related activity, and plumbing repairs may use other methods like soldering (for non - ferrous pipes) or other welding techniques less common than GMAW in this context.
• Question 14: A welder performing GMAW must protect their eyes (welding helmet with filter), eyes (safety glasses as an additional layer in some cases), hands (leather gloves), and body (welding jacket). Safety knee pads are for knee protection (not directly related to welding hazards like sparks and UV rays from the arc), earplugs are for noise protection (not the minimum for welding arc - related hazards), and gardening gloves are not heat - resistant enough for welding.
• Question 15: GMAW is a versatile welding process that can be used in flat, horizontal, vertical, and overhead positions. It is not limited to only one or two of these positions.
• Question 16: In GMAW, the wire feed speed is related to the amount of metal being fed into the weld pool. Since the resistance of the wire (as it is fed) affects the welding current (Ohm's law \(I=\frac{V}{R}\), and the wire's resistance is a factor), the wire feed speed control manages the welding current. Arc voltage is more related to the distance between the wire tip and the workpiece, gas flow rate is controlled by a separate regulator, and wire diameter is a pre - selected parameter (not controlled by the wire feed speed in terms of changing its size during welding).
• Question 17: Spatter in GMAW refers to unwanted drops of molten metal that are expelled from the weld pool. It is not the metal filler wire (which is the consumable electrode), not excessive sparks (which are a different phenomenon, usually more transient and less massive than spatter), and not the shielding gas.
• Question 18: The typical diameter of the welding wire used in GMAW is in the range of 0.030 to 0.045 inch. Larger diameters like 1/4 inch, 1/8 inch, and 1/16 inch are either too large (for the fine - wire, spray - transfer or short - circuit transfer modes typical in GMAW) or not the standard range.

Answer:

1. C. Automotive welding
2. C. Welding helmet with appropriate filter, Safety glasses, leather gloves and a welding jacket
3. A. Flat, horizontal, vertical, and overhead
4. D. Manage the welding current
5. C. Unwanted drops of molten metal
6. C. 0.030 to 0.045 inch